Résumé du preprint DAPNIA-04-338

DAPNIA-04-338
Upgrade of the Cryomodule Prototype before its Implementation in SOLEIL
P. Bosland, P. Bredy, S. Chel, G. Devanz, CEA Saclay, 91191 Gif sur Yvette cedex, France P. Marchand, K. Tavakoli, C. Thomas-Madec, SYNCHROTRON SOLEIL, Saint-Aubin, 91192 Gif sur Yvette cedex, France R. Losito, CERN, CH-1211, Genève 23, Switzerland
In the Storage Ring (SR) of the SOLEIL Synchrotron light source, two cryomodules will provide the maximum power of 600 kW required at the nominal energy of 2.75 GeV with the full beam current of 500 mA.
A cryomodule prototype, housing two 352 MHz superconducting single-cell cavities with strong damping of the Higher Order Modes has been built and successfully tested in the ESRF storage ring. Even though the achieved performance (3 MV and 380 kW) does meet the SOLEIL requirement for the 1st year of operation, the cryomodule prototype will be upgraded before its installation on the SR early 2005. Modifications will be made on the internal cryogenic system, and also on the power and dipolar HOM couplers. That requires a complete disassembling and reassembling of the cryomodule, which is being carried out at CERN within the framework of collaboration between SOLEIL, CEA and CERN.
Additional 3D RF calculations have been performed on the full SOLEIL RF structure in order to get a more detailed description of the damping of the dipolar modes and to optimise the tuning of the dipolar couplers.
A second cryomodule, similar to the modified prototype, will be built and installed in the SR about one year later.
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